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ما معنى الخلايا حقيقية النواة Eukaryotic Cell

تعتبر الخلايا حقيقية النواة Eukaryotic Cell أكثر تعقيدًا من الخلايا بدائية النواة كما أنها الوحدة الأساسية للحياة لمعظم الكائنات الحية.

d MMM, yyyy أكتوبر 07, 2021 يناير 04, 2022

تعد الخلايا حقيقية النواة Eukaryotic Cell أكثر تعقيدًا من الخلايا بدائية النواة كما أنها تشكل الوحدة الأساسية للحياة في معظم الكائنات الحية.

معنى الخلية حقيقية النواة

يمكن تعريف حقيقية النواة على أنها خلايا ذات نواة حقيقية ومتواجدة في ممالك وعوالم كل من

الطليعيات Protesta
الفطريات Fungi
النباتات Plantae
الحيوانات Animalia

أشكال الخلايا حقيقية النوى

تختلف الخلايا حقيقية النوى في الشكل البعض منها ذات اشكال ثابتة مثل العمودية والبيضوية والكروية والهرمية والأنبوبية والمكعبة والمسطحة والنجمية والمغزلية.

رسم تخطيطي لخلية حقيقية النواة Eukaryotic Cell

والبعض الآخر شكل غير ثابت حيث يتغير من وقت لاخر مثل الامیبا. ويمكن ان يعزى التغير في الشكل إلى الوظيفة التي تؤديها الخلايا حيث غالبا مايكون للخلايا شكل يناسب الوظيفة التي تقوم بها .

معظم الخلايا حقيقية النوى صغيرة وتحتاج الى مجهر لرؤيتها لكنها بلا شك اکبر حجما من الخلايا بدائية النواة. بشكل عام تحتاج الخلية الى مساحة سطحية (الغشاء البلازمي) لتكون قادرة من خلالها على القيام بعملية تبادل المواد مع محيطها بشكل صحيح .

بنية الخلية حقيقية النواة

تتكون الخلايا حقيقية النواة من أربعة أجزاء رئيسية هي

جدار الخلية Cell Wall غير موجود في الخلية الحيوانية
الغشاء البلازمي Plasma Membrane
السايتوبلازم Cytoplasm
النواة Nucleus

تعليقات

رسائل أحدث رسائل أقدم


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